Sunday 24th March 2019?Estimated delivery dates -include handling time, container booking & availability and also receipt of cleared payment. A payment is considered "cleared" after the money from the buyer has been deposited into Kemcore's account.

Pregnant gold solutions are passed through activated carbon, where the gold is adsorbed on carbon.

We supply several grades of activated carbon for improved gold recovery. We pride ourselves in ensuring the following carbon properties are enjoyed by our clients:

Our carbon is coconut shell-based giving it low susceptibility to attrition because of its hardness.

It has excellent activity making gold adsorption easy

We also offer activated carbon in several size fractions which gives an array of properties that can suit any particular process.

With good carbon management practices, our activated carbon has proven to have longer life in the circuit. This is attributed to its ease of regeneration, hardness even under severe CIP conditions as well as maintenance of high levels of activity.

Carbon loading varies from 300g/ton to as much as 20 000g of gold/ton of carbon

There are several grades of activated carbon, but for gold processing E612 and E816 are the most commonly used.

The main sizes of activated carbon for gold processing are given in the table below:

Form

Mean Particle Size (mm)

Size Fraction (US sieve no.)

Raw Material

Granular

2.5

6*12

Coconut Shell

Granular

2.1

6*16

Coconut Shell

Granular

1.7

8*16

Coconut Shell

There are 3 main methods of adsorbing gold on activated carbon in gold leaching:

Carbon-in-leach (CIL) – in CIL, leaching and CIP are integrated into a single process. Gold is thus adsorbed on the carbon almost as soon as it is dissolved in cyanide. CIL is the preferred method where there are preg-robbing elements in the ore which would otherwise compete for gold with carbon. The activated carbon has to have a high activity to adsorb the gold before any other competing carbon forms do so.

Carbon-in-Pulp (CIP) – in CIP, there are several agitated tanks where NaCN, lime and oxygen are added to dissolve the gold. The carbon is placed in inter-stage screens and moves counter current to the flow of pulp through the tanks.

Carbon-in-Column (CIC) – in these solution flows through a series of fluidized beds which can process solution with as low as 2% solids. CIC is mainly used to recover gold from heap leach circuits.

The 3 size fractions in the table above all have individual advantages and disadvantages.

Generally because of increased surface area, the smaller the size fraction, the higher the gold loading capacity. Inter-stage screen management in CIP especially because of the high attrition forces the carbon is exposed to is very important. Large size fractions are recommended to ensure one never losses gold through the screens. Of the three sizes above 6*12 would thus be recommended in CIP and to an extent CIL.

8*16 can be safely used in plants employing CIC.

Factors Affecting Adsorption rate

Fouling – this is the contamination of activated carbon during use. Major foulants are some flotation reagents, greases used to oil agitators or mills

Time of contact – the longer this is the more efficient the adsorption

Loaded carbon from CIC, CIL or CIP is removed and washed before undergoing elution at high temperature and pH. Typical solution concentrations for pressure stripping consist of % NaCN and % NaOH. Elution brings back the gold into solution before it is captured by wirewool in electrowinning cells.

With thousands of suppliers competing for our business, Kemcore has proven to be the most reliable and consistent import/export company in China, offering quality chemicals at competitive prices. We strive to continue working with them.

Macheng Macheng

Senior Buyer

KS Energy (Pty) Ltd

Kemcore’s greatest advantage is understanding our culture, values, and expectations for business transactions, quality, and delivery from the Asian market feeding into Africa. Our business started with trial orders of 20 tons to the current 350 tons per month.

Mike Peto

Managing Director

Sesani EPCM

Our import volume of chemicals and other mining accessories stands at $5.65mil/yr. We have significantly increased our market share due to the competitiveness & consistency in quality.

Menfred Mukumba (MCIPS)

Supply Chain Manager

Intrachem Pvt Ltd

Kemcore continues to be instrumental in
procuring a complete suite of reagents for
our gold/copper flotation plant . I do not hesitate to recommend Kemcore services for Xanthate, DTP's plant reagent supply, especially when procuring out of China.

Brienie Dzumbunu

Metallurgical Superintendent

Pan African Mining

We don't work only with the giants of the mining industry. Our clients include many small-to-medium-sized businesses.